Reoent Research on Ship Waves 



Fig. 6 UNCATENA model 

 bow view 



Fig. 7 UNCATENA model 

 side view 



distinguishable, whereas further downstream these blend into a single 

 diverging wave pattern with several nodal regions. It is apparent 

 that, on the model scale, more than three wave groups can be 

 distinguished far downstream; in Fig, 10 four or possibly five dis- 

 crete groups can be noted. Since viscous attenuation is stronger at 

 the smaller Reynolds numbers corresponding to the model scale, 

 it must be presumed that the attenuation of the short diverging waves 

 in the full-scale tests is due to other effects, such as the higher level 

 of ambient waves and turbulence in the full-scale flow. Another 

 noticeable difference is the obvious presence of transverse waves 

 in the model tests, especially in Fig. 9 which is from approximately 

 the same viewing angle as the full-scale photograph shown in Fig, 5, 



Fig, 8 UNCATENA model and wave system 

 (compare with Fig, 5) 



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